Big Little Lies co-stars Nicole Kidman and Reese Witherspoon are reportedly feuding over their new HBO show. According to New Idea, Reese is unhappy with her BFF Nicole for spending all her press time promoting her Oscar-nominated film Lion opposed to their miniseries.

"Reese is furious that Nicole hasn't done more to support Big Little Lies. All she's talked about in interviews is Lion. Had Reese known that Nicole would put the show so far on the backburner, she would have cast some random," an insider told the news outlet.

Nicole and Reese happily posing together before their show aired. (Photo Credit: Getty Images)

The tension between the two allegedly began at the Oscars in February 2017. "You could cut the tension with a knife at the Oscars. Nicole was telling her people to keep Reese away from her — there's no love lost at all," the insider added.

Sources additionally revealed the two had a lot of "tense arguments" while filming Big Little Lies – which may even result in them never working together again! "If the show doesn't make any waves or get better ratings, it will probably mark the end of Reese and Nicole's joint ventures," they claimed.

Reese recently took to Instagram to share a funny text from her mother about her new series! The convo began with a message from Betty Reese that read, "I saw Little Lies tonight and I liked it, ❤️ Mom." Then, Reese responded with, "Great!! Tonight was a good one."